Insulation of armatures for dynamo-electric machines



(No Model.)

B. EIOKEMEYER. INSULATION 0F ARMATURES FOR DYNAMO ELECTRIC MACHINES. No. 450,367.

Patented Apr. 14,1891.

NITED STATES PATENT OFFICE.

RUDOLF EICKEMEYER, OF YONKERIS, NEYV YORK.

INSULATION OF ARMATURES FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 450,367, dated April 14, 1891,

Application filed August 28,1890. Serial No. 368,289. No model.)

To all whom it may concern:

Be it known that I, RUDOLF Eronnnnrnn, of Yonkers, in the county of Westehester and State of New York, have invented certain new and useful Improvements in the Insulation of Armature-Cores for Dynamo-Electric Machines; and I do hereby declare that the following specification, taken in connection with the drawings furnished and forming a part of the same, is a clear, true, and complete description of my invention.

The objects of my invention are to secure the practically perfect insulation of armatureeores by means of a jacket or covering, which, with respect of joints between portions of the sheet-like material used, is a practically solid jacket in that every interior joint is not only covered by some overlying portion of the material, but the latter is so applied in crossed layers that the neeessaryliquefied or adhesive insulating matter cannot get cracked or impaired during a handling of clothed cores, or as a result of possible peripheral strains during the application of the winding, or while subsequently in use as an armature in a dynamo-electric machine. I accomplish these ends by clothing the drum or core of an armature with what is or may be in substance a continuous narrow strip of suitable material which at its initial end is secured near the surface of the axial hub of the core at one end thereof, and is then tangentially laid on said end to the periphery of the core, thence diagonally or spirally along the face of the core, over the opposite edge, and thence across the opposite end, at one side of the hub opposite to that side of the first hub at which the initial end is secured, and so on in regular order, one edge of each wrapping lying closely in contact with the adjacent edge of the wrap last laid until the core has been completely covered, whereupon the terminal end is secured to the end of the core. hen thus wound there are two complete layers of the insulatingtextile material at every portion of the surface of the core, because as the winding progresses each underlying portion of the strip is overlaid by numerous other portions of the strip, in diagonal lines, on the face of the core, and at both ends the core is equally well or better protected or clothed.

Referring to the drawings, Figures 1 and 2, respectively, illustrate in end and side view an armatureeere, as illustrated by me in accordance with my invention.

Armature-cores may be clad in accordance with the main features of myinventionwitlr out restriction as to the insulating material employed, so long as it may be prepared in strip form of suitable width, and be sufficiently flexible to enable it to be progressively applied as in winding. Thin properly-prepared vulcanized fiber will serve a good purpose, or asbestus cloth, or suitably-prepared paper; but for general purposes I employ strips of cotton cloth, or wide tape or webbing, and depend upon the application thereto of liquefied or adhesive insulating matter-such as shellac varnish-forsecuringdesirableresults. Some strip formed materials may be employed which will serve a fairly good purpose without such adhesive matter, such interstices as may occur being verysmall, and the space between the wirewinding of an armature and the core being such as to effectively afford air insulation.

The strip of fabric a, as shown in the drawings,is secured at its initial end-say, at (1/- at one side of the hub of the core, and is laid smoothly and under proper tension tangentially to the edge a of the core, and thence diagonally, as at a along the face of the core to the opposite edge a thence in a straight line across that end at the side of the hub opposite to the location of the initial end, back diagonally along the face of the drum or core, and thence across the port-ion last laid at the end of the core, and so on, one edge of the newly-laid. portion of the strip being placed in close contact with an edge of a previously-laid portion on the face of the core. The strip-winding is continued in this manner until the core is fully covered and then the terminal end is secured to the end of the core, as at a The result of the winding is two complete layers of the fabric on the face of the armature, the outer layer consisting of portions of the strip of fabric which diagonally overlie the portions which constitute the inner layer, as is clearly indicated in Fig. 2, and the ends'of the core are also specially well jacketed, because each portion of the fabric as it is wound diagonally crosses the end portion last previously wound.

It will be seen that every portion of the j acketingis symmetrical and smooth, and that all points of the fabric may be tightly laid and absolutely secure at the edges of the core, and that there is a substantially uniform solidity, strength,and firmness at every portion of the jacket, which, when considered in connection with properlyapplied varnish, renders the covering a practically solid and seamless insulating jacket.

The two layers on the face of the core in strips which are diagonal in each layer and reversed in their spiraled relations I deem an important feature, even if each strip be no longer than from the hub on one end to the hub on theother, and the charging of the material with liquefied or adhesive insulating matter may in many cases be omitted, as when textile material or paper is not employed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. An armature drum or core for dynamoelectric machines clothed on its face with an innerlayer of narrowinsulating material laid other'portionsbetween the hubsand the edges 7 of the core, substantially as described.

3. An armature drum or core for dynamoelectric machines inclosed in a jacket composed of a strip of fibrous material Wound on said core continuously from end to end, diagonally or spirally on the face of the core in two oppositel'y-spiraled layers, said material crossing the ends of the core, and each portion crossed by many other portions between the hubs of the core and its edges, and the whole well charged with suitableliquefied or adhesive insulating matter, substantially as described.

RUDOLF EICKEMEYER.

Witnesses:

HENRY OSTERHELD, CHARLES STEINMETZ. 

